Jennifer Lopez is so furious over Casper Smart’s big mouth that she’s cutting his monthly allowance by a hefty 25 percent, say sources. Jennifer went ballistic when Casper blabbed during an interview that Jen would be returning to American Idol next season as a judge. Fox bosses were banking on making their own big announcement about Jennifer’s return.
“Jennifer caught hell from Idol producers… they wanted to hold a major press conference, not have a boyfriend leak it out.”

Although Casper pleaded ignorance, Jennifer was beyond steamed.

“This was Jennifer’s biggest fear… Casper is young and doesn’t understand the business, which makes life very difficult for her. It’s beginning to dawn on her that he’s a liability. Casper’s slip was very amateurish. Jennifer couldn’t believe he’d be so stupid. The Idol team had a big launch planned and he ruined it.”

To make matters even more embarrassing, J.Lo had stalled on signing her contract until the studio gave Casper a cushy job on the show. Casper is begging Jennifer for forgiveness, but Jennifer is hitting her big-spending boyfriend where it hurts most – in his wallet.

“Jennifer cut a quarter of the $10,000 monthly allowance she gives him,” revealed an insider.

Friends are confounded that Jennifer doesn’t cut Casper loose. What’s more, her mom Guadalupe “doesn’t approve of Casper,” said a source, and she was “livid to learn they were thinking about adopting a kid, strengthening their bond.”

Still, Jennifer has it bad for Casper. A source revealed: “J.Lo says Casper is the best sex she’s ever had.”

Hey Casper, somebody called our office today to say that they found your balls, but they threw them away ’cause you don’t really need ‘em anymore.